Isolated palmar dislocation of the trapezoid

Combined Dislocation of the Trapezium and the Trapezoid: A Case Report with Review of the Literature

“…Isolated dislocation of the trapezoid may similarly occur in a volar [7,19,22,23,25,51] dorsal surface of the trapezoid during wrist extension, the constraints of the bony anatomy (particularly of the scaphoid) when the wrist is in dorsiflexion, and the presence of weaker ligaments dorsally than palmarly [1, 22, 29-31, 38, 42, 44]. A mechanism for dorsal dislocation of the trapezoid due to a blow to the distal dorsal end of the second metacarpal with the wrist in slight flexion has been proposed [6,[29][30][31]47].…”

Palmar dislocation of the trapezoid

“…Two cases were related to smashing injuries [1,11], and the exact mechanism was not known in three patients. Seven of 12 dislocations occurred as various work-related injuries, whereas four injuries were caused by motor vehicle collisions [1,4,5,8]. The case presented here involved a fall from a height at work.…”

“…Only 12 of these patients had a palmar dislocation (Table 1) [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]; in the remainder the trapezoid was dorsally dislocated. Palmar dislocation was associated with other fractures or dislocations of the wrist in eight patients and observed as an isolated injury in four patients (exclusive of proximal migration of the second metacarpal, which is a typical consequence of the trapezoid dislocation) [2,3,5,11]. We present a case of palmar dislocation of the trapezoid associated with dorsal subluxation of the second metacarpal, radial migration of the third and fourth metacarpals, and an additional dorsal avulsion fracture of the triquetrum.…”

Trans-scaphoid mid-carpal dislocation associated with radial styloid fracture: A rare injury

“…14 Kopp reported on an isolated trapezoid dislocation. 8 Mayfield et al described the spectrum of ligamentous injury involving rotational subluxation of the scaphoid resulting in dorsal peri-lunate dislocation and volar lunate dislocation. 9 Russell reported that 58 of their 59 patients sustained a fracture dislocation of the carpus resulting from hyperextension of the wrist.…”